Trigger Ranges

#include <Servo.h>

Servo servoLeft;
Servo servoRight;

int distance = 0;

const int triggerPin = 2;
const int echoPin = 3;

const int leftLow = 125;
const int leftHigh = 135;

const int rightLow = 95;
const int rightHigh = 105;

long readUltrasonicDistance(int triggerPin, int echoPin)
{
    digitalWrite(triggerPin, LOW);
    delayMicroseconds(2);
    // Sets the trigger pin to HIGH state for 10 microseconds
    digitalWrite(triggerPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(triggerPin, LOW);
    // Reads the echo pin, and returns the sound wave travel time in microseconds
    return pulseIn(echoPin, HIGH);
}

int counter;

void setup()
{
    Serial.begin(9600);
    pinMode(triggerPin, OUTPUT);
    pinMode(echoPin, INPUT);
  
  	servoLeft.attach(9);
  	servoRight.attach(10);
}

void loop()
{
    distance = 0;
    distance = 0.01723 * readUltrasonicDistance(triggerPin, echoPin);

    if (distance >= leftLow && distance <= leftHigh)
    {
        Serial.print("Left triggered: ");
        Serial.println(distance);
      	servoLeft.write(90);
      	delay(2000);
    }
    else if (distance >= rightLow && distance <= rightHigh)
    {
        Serial.print("Right triggered: ");
        Serial.println(distance);
      	servoRight.write(90);
      	delay(2000);
    }
    else
    {
        Serial.println("No trigger");
      	servoLeft.write(0);
      	servoRight.write(0);
    }

    delay(1000); // Wait for 1 sec
}